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Consolidated Investment Entities - Fair Value Hierarchy (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets   $ 6,931.3 $ 5,160.2
Liabilities   3,829.4 2,057.1
Measured at fair value on a recurring basis
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 8,497.8 6,931.3  
Liabilities 4,881.3 3,829.4  
Measured at fair value on a recurring basis | VIEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 861.4 360.6 98.3
Measured at fair value on a recurring basis | VIEs | Corporate Loans
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 4,573.5 3,559.3 2,162.9
Measured at fair value on a recurring basis | VIEs | Collateralized Debt Obligations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Liabilities 4,881.3 3,829.4 2,057.1
Measured at fair value on a recurring basis | VOEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 75.2 80.2 38.7
Measured at fair value on a recurring basis | VOEs | Limited partnerships/corporations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 2,987.7 2,931.2 2,860.3
Level 1 | Measured at fair value on a recurring basis
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 936.6 440.8 137.0
Liabilities 0 0 0
Level 1 | Measured at fair value on a recurring basis | VIEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 861.4 360.6 98.3
Level 1 | Measured at fair value on a recurring basis | VIEs | Corporate Loans
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 1 | Measured at fair value on a recurring basis | VIEs | Collateralized Debt Obligations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Liabilities 0 0 0
Level 1 | Measured at fair value on a recurring basis | VOEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 75.2 80.2 38.7
Level 1 | Measured at fair value on a recurring basis | VOEs | Limited partnerships/corporations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets   0 0
Level 2 | Measured at fair value on a recurring basis
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 4,573.5 3,559.3 2,162.9
Liabilities 0 0 0
Level 2 | Measured at fair value on a recurring basis | VIEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 2 | Measured at fair value on a recurring basis | VIEs | Corporate Loans
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 4,573.5 3,559.3 2,162.9
Level 2 | Measured at fair value on a recurring basis | VIEs | Collateralized Debt Obligations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Liabilities 0 0 0
Level 2 | Measured at fair value on a recurring basis | VOEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 2 | Measured at fair value on a recurring basis | VOEs | Limited partnerships/corporations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 3 | Measured at fair value on a recurring basis
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 2,987.7 2,931.2 2,860.3
Liabilities 4,881.3 3,829.4 2,057.1
Level 3 | Measured at fair value on a recurring basis | VIEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 3 | Measured at fair value on a recurring basis | VIEs | Corporate Loans
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 3 | Measured at fair value on a recurring basis | VIEs | Collateralized Debt Obligations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Liabilities 4,881.3 3,829.4 2,057.1
Level 3 | Measured at fair value on a recurring basis | VOEs | Cash and Cash Equivalents
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets 0 0 0
Level 3 | Measured at fair value on a recurring basis | VOEs | Limited partnerships/corporations
      
Fair Value Assets Liabilities Quantitative Information [Line Items]      
Assets $ 2,987.7 $ 2,931.2 $ 2,860.3